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Javadi A, Dowlati S, Shourni S, Miller R, Kraume M, Kopka K, Eckert K. Experimental techniques to study protein-surfactant interactions: New insights into competitive adsorptions via drop subphase and interface exchange. Adv Colloid Interface Sci 2022; 301:102601. [PMID: 35114446 DOI: 10.1016/j.cis.2022.102601] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 01/10/2022] [Indexed: 01/05/2023]
Abstract
Protein surfactant (PS) interactions is an essential topic for many fundamental and technological applications such as life science, nanobiotechnology processes, food industry, biodiesel production and drug delivery systems. Several experimental techniques and data analysis approaches have been developed to characterize PS interactions in bulk and at interfaces. However, to evaluate the mechanisms and the level of interactions quantitatively, e.g., PS ratio in complexes, their stability in bulk, and reversibility of their interfacial adsorption, new experimental techniques and protocols are still needed, especially with relevance for in-situ biological conditions. The available standard techniques can provide us with the basic understanding of interactions mainly under static conditions and far from physiological criteria. However, detailed measurements at complex interfaces can be formidable due to the sophisticated tools required to carefully probe nanometric phenomena at interfaces without disturbing the adsorbed layer. Tensiometry-based techniques such as drop profile analysis tensiometry (PAT) have been among the most powerful methods for characterizing protein's and surfactant's adsorption layers at interfaces via measuring equilibrium and dynamic interfacial tension and dilational rheology analysis. PAT provides us with insightful data such as kinetics and isotherms of adsorption and related surface activity parameters. However, the data analysis and interpretation can be challenging for mixed protein-surfactant solutions via standard PAT experimental protocols. The combination of a coaxial double capillary (micro flow exchange system) with drop profile analysis tensiometry (CDC-PAT) is a promising tool to provide valuable results under different competitive adsorption/desorption conditions via novel experimental protocols. CDC-PAT provides unique experimental protocols to exchange the droplet subphase in a continuous dynamic mode during the in-situ analysis of the corresponding interfacial adsorbed layer. The contribution of diffusion/convection mechanisms on the kinetics of the adsorption/desorption processes can also be investigated using CDC-PAT. Here, firstly, we review the commonly available techniques for characterizing protein-surfactant interactions in the bulk phase and at interfaces. Secondly, we give an overview for applications of the coaxial double capillary PAT setup for investigations of mixed protein-surfactant adsorbed layers and address recently developed protocols and analysis procedures. Exploring the competitive sequential adsorption of proteins and surfactants and the reversibility of pre-adsorbed layers via the subphase exchange are the particular experiments we can perform using CDC-PAT. Also the sequential and simultaneous competitive adsorption/desorption processes of some ionic and nonionic surfactants (SDS, CTAB, DTAB, and Triton) and proteins (bovine serum albumin (BSA), lysozyme, and lipase) using CDC-PAT are discussed. Last but not least, the fabrication of micro-nanocomposite layers and membranes are additional applications of CDC-PAT discussed in this work.
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Ashoorian S, Javadi A, Hosseinpour N, Husein M. Evolution of adsorbed layers of asphaltenes at oil-water interfaces: A novel experimental protocol. J Colloid Interface Sci 2021; 594:80-91. [PMID: 33756371 DOI: 10.1016/j.jcis.2021.02.123] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 02/25/2021] [Accepted: 02/26/2021] [Indexed: 10/22/2022]
Abstract
HYPOTHESIS Asphaltenes can form rigid interfacial films surrounding water droplets rendering water separation from crude oil sluggish. Therefore, the quantitative characterization of such complex film formation is of great importance. As the adsorbed layers of asphaltene illustrate crumpling under compression at certain conditions, the evolution process from soft to rigid states of the film can be evaluated considering standard deviations from Young-Laplace shape fitting. EXPERIMENTAL In this study, novel experimental protocols are introduced to investigate the evolution of adsorbed asphaltene layer to a film of aggregates at model oil/water interface by means of dynamic interfacial tension (IFT) and dilational surface rheology measurements. In particular, the surface elasticity and standard deviation from the Young-Laplace shape fitting (YL-SD) are introduced as important indicators for the transformation of a regular asphaltene adsorbed layer to a film of aggregates. Different parameters affecting the film formation and stability, such as aging time, asphaltene concentration, and history of interfacial dynamics, are discussed and linked to emulsion stability. FINDINGS It is shown for the first time that the standard deviation of drop profile fitting from the Young-Laplace equation can be used as a rigorous parameter to reveal the properties of the interfacial asphaltene film, which cannot be recognized by regular IFT measurements. Via this novel technique, it is revealed that the transformation of an asphaltene adsorbed layer to a rigid film depends not only on the asphaltene concentration but also on the aging time and the interfacial area perturbations. The results of this new method are supported by measurements of the dilational surface elasticity, which is known as an important parameter for the characterization of complex adsorbed layers, and further verified by an emulsion stability analysis.
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Affiliation(s)
- Sefatallah Ashoorian
- Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, 11155-4563 Tehran, Iran
| | - Aliyar Javadi
- Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, 11155-4563 Tehran, Iran; Institute of Process Engineering and Environmental Technology, TU Dresden, 01062 Dresden, Germany.
| | - Negahdar Hosseinpour
- Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, 11155-4563 Tehran, Iran.
| | - Maen Husein
- Department of Chemical & Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
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Guo ZY, Cao XL, Guo LL, Zhao ZY, Ma BD, Zhang L, Zhang L, Zhao S. Studies on interfacial interactions between petroleum sulfonate and sulfobetaine molecules by rheological measurements. J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2020.1725543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Zhao-yang Guo
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
- University of Chinese Academy of Sciences, Beijing, P. R. China
| | - Xu-long Cao
- Exploration & Development Research Institute, Shengli Oilfield, SINOPEC, Dongying, Shandong, P. R. China
| | - Lan-lei Guo
- Exploration & Development Research Institute, Shengli Oilfield, SINOPEC, Dongying, Shandong, P. R. China
| | - Zhi-yi Zhao
- Department of Investment and Development, Shengli Oilfield Company, SINOPEC, Dongying, Shandong, P. R. China
| | - Bao-dong Ma
- Exploration & Development Research Institute, Shengli Oilfield, SINOPEC, Dongying, Shandong, P. R. China
| | - Lei Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
| | - Lu Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
| | - Sui Zhao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
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In honor to Ramón G. Rubio on the occasion of his 65th birthday. Adv Colloid Interface Sci 2020; 282:102202. [PMID: 32663706 DOI: 10.1016/j.cis.2020.102202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This Honorary Note is dedicated to the 65th birthday of Ramón G. Rubio and summarizes some of his contributions to the current knowledge in the science and technology of colloids and interfaces. Since 1995, Ramón González Rubio is Full Professor at the Complutense University of Madrid (Spain) where he has developed an extensive research activity in different scientific and technological aspects related to colloidal systems and interfacial phenomena: from particle-laden interfaces to polyelectrolyte multilayers, including the kinetics of simultaneous spreading and evaporation of solutions (and dispersions) and interfacial rheology. This broad research activity has contributed to some of the most recent advances in colloid and interface science, which is reflected in more than 200 papers in peer-reviewed journals and more than 4000 citations according to the Web of Science.
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Zhang Y, Cai HY, Hu SS, Li JG, Gong QT, Ma WJ, Liu ZY, Zhang L, Zhang L, Zhao S. Interfacial dilational properties of betaines and sulfonate mixtures: Effects of alkyl chain length. J DISPER SCI TECHNOL 2020. [DOI: 10.1080/01932691.2018.1561305] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Yi Zhang
- State Key Laboratory of Enhanced Oil Recovery, Beijing, P. R. China
- PetroChina Research Institute of Petroleum Exploration & Development, Beijing, P. R. China
| | - Hong-Yan Cai
- State Key Laboratory of Enhanced Oil Recovery, Beijing, P. R. China
- PetroChina Research Institute of Petroleum Exploration & Development, Beijing, P. R. China
| | - Song-Shuang Hu
- Yanshan Branch, Beijing Research Institute of Chemical Industry, SINOPEC, Beijing, P. R. China
| | - Jian-Guo Li
- State Key Laboratory of Enhanced Oil Recovery, Beijing, P. R. China
- PetroChina Research Institute of Petroleum Exploration & Development, Beijing, P. R. China
| | - Qing-Tao Gong
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
| | - Wang-Jing Ma
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
| | - Zi-Yu Liu
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
| | - Lei Zhang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
| | - Lu Zhang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
| | - Sui Zhao
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
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Shahlori R, McDougall DR, Waterhouse GIN, Yao F, Mata JP, Nelson ARJ, McGillivray DJ. Biomineralization of Calcium Phosphate and Calcium Carbonate within Iridescent Chitosan/Iota-Carrageenan Multilayered Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8994-9003. [PMID: 29961323 DOI: 10.1021/acs.langmuir.8b00434] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This work systematically explores the biomineralization of calcium phosphate (CaP) and carbonate (CaCO3) within chitosan/iota-carrageenan multilayer films. Multilayer films of chitosan and iota-carrageenan (up to 128-coupled layers) were prepared on glass substrates by a layer-by-layer dip-coating technique. Cryo-scanning electron microscopy revealed dense interfaces between the chitosan and iota-carrageenan layers with thicknesses in the range 250 and 350 nm in the hydrated state, accounting for the iridescent nature of multilayer films when wet. Immersion of the multilayered films in simulated body fluid or simulated seawater at 25 °C resulted in the mineralization of CaP and CaCO3, respectively, at the interfaces between the biopolymer layers and modified the iridescence of the films. Lamellar scattering features in small-angle neutron scattering measurements of the mineralized films provided evidence of the localized mineralization. Further evidence of this was found through the lack of change in the dynamic and static correlation lengths of the polymer networks within the bulk phase of the chitosan and iota-carrageenan layers. CaP mineralization occurred to a greater extent than CaCO3 mineralization within the films, evidenced by the higher lamellar density and greater rigidity of the CaP-mineralized films. Results provide valuable new insights into CaP and CaCO3 biomineralization in biopolymer networks.
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Affiliation(s)
- Rayomand Shahlori
- School of Chemical Sciences , University of Auckland , Private Bag, 90219 Auckland , New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology , Wellington 6140 , New Zealand
| | - Daniel R McDougall
- School of Chemical Sciences , University of Auckland , Private Bag, 90219 Auckland , New Zealand
| | - Geoffrey I N Waterhouse
- School of Chemical Sciences , University of Auckland , Private Bag, 90219 Auckland , New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology , Wellington 6140 , New Zealand
| | - Feihong Yao
- School of Chemical Sciences , University of Auckland , Private Bag, 90219 Auckland , New Zealand
| | - Jitendra P Mata
- Australian Nuclear Science and Technology Organization , Locked Bag 2001, Kirrawee DC , New South Wales 2232 , Australia
| | - Andrew R J Nelson
- Australian Nuclear Science and Technology Organization , Locked Bag 2001, Kirrawee DC , New South Wales 2232 , Australia
| | - Duncan J McGillivray
- School of Chemical Sciences , University of Auckland , Private Bag, 90219 Auckland , New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology , Wellington 6140 , New Zealand
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Chernysheva MG, Badun GA, Shnitko AV, Petrova VI, Ksenofontov AL. Lysozyme-surfactant adsorption at the aqueous-air and aqueous-organic liquid interfaces as studied by tritium probe. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.048] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Cao C, Cao LD, Huang QL, Du FP. Impact of imidazolium-based ionic liquid surfactant additions on dilational rheology properties of different protein adsorption layer. J DISPER SCI TECHNOL 2017. [DOI: 10.1080/01932691.2017.1281143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Chong Cao
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Li-Dong Cao
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Qi-Liang Huang
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Feng-Pei Du
- Department of Applied Chemistry, College of Science, China Agriculture University, Beijing, China
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Noskov BA, Krycki MM. Formation of protein/surfactant adsorption layer as studied by dilational surface rheology. Adv Colloid Interface Sci 2017; 247:81-99. [PMID: 28716186 DOI: 10.1016/j.cis.2017.07.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 06/19/2017] [Accepted: 07/02/2017] [Indexed: 12/25/2022]
Abstract
The review discusses the mechanism of formation of protein/surfactant adsorption layers at the liquid - gas interface. The complexes of globular proteins usually preserve their compact structure a low surfactant concentrations. Therefore a simple kinetic model of the adsorption of charged compact nanoparticles is discussed first and compared with experimental data. The increase of surfactant concentrations results in various conformational transitions in the surface layer. One can obtain information on the changes of the adsorption layer structure using the dilational surface rheology. The kinetic dependencies of the dynamic surface elasticity are strongly different for the adsorption of unfolded macromolecules and compact globules, and have local maxima in the former case corresponding to different steps of the adsorption. These distinctions allow tracing the changes of the tertiary structure of protein/surfactant complexes in the surface layer. The adsorption from mixed solutions of ionic surfactants with β-casein, β-lactoglobulin, bovine serum albumin and myoglobin is discussed with some details.
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10
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Thermodynamics, interfacial pressure isotherms and dilational rheology of mixed protein-surfactant adsorption layers. Adv Colloid Interface Sci 2016. [PMID: 26198014 DOI: 10.1016/j.cis.2015.06.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Proteins and their mixtures with surfactants are widely used in many applications. The knowledge of their solution bulk behavior and its impact on the properties of interfacial layers made great progress in the recent years. Different mechanisms apply to the formation process of protein/surfactant complexes for ionic and non-ionic surfactants, which are governed mainly by electrostatic and hydrophobic interactions. The surface activity of these complexes is often remarkably different from that of the individual protein and has to be considered in respective theoretical models. At very low protein concentration, small amounts of added surfactants can change the surface activity of proteins remarkably, even though no strongly interfacial active complexes are observed. Also small added amounts of non-ionic surfactants change the surface activity of proteins in the range of small bulk concentrations or surface coverages. The modeling of the equilibrium adsorption behavior of proteins and their mixtures with surfactants has reached a rather high level. These models are suitable also to describe the high frequency limits of the dilational viscoelasticity of the interfacial layers. Depending on the nature of the protein/surfactant interactions and the changes in the interfacial layer composition rather complex dilational viscoelasticities can be observed and described by the available models. The differences in the interfacial behavior, often observed in literature for studies using different experimental methods, are at least partially explained by a depletion of proteins, surfactants and their complexes in the range of low concentrations. A correction of these depletion effects typically provides good agreement between the data obtained with different methods, such as drop and bubble profile tensiometry.
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Guzmán E, Llamas S, Maestro A, Fernández-Peña L, Akanno A, Miller R, Ortega F, Rubio RG. Polymer-surfactant systems in bulk and at fluid interfaces. Adv Colloid Interface Sci 2016; 233:38-64. [PMID: 26608684 DOI: 10.1016/j.cis.2015.11.001] [Citation(s) in RCA: 142] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 10/30/2015] [Accepted: 11/02/2015] [Indexed: 11/30/2022]
Abstract
The interest of polymer-surfactant systems has undergone a spectacular development in the last thirty years due to their complex behavior and their importance in different industrial sectors. The importance can be mainly associated with the rich phase behavior of these mixtures that confers a wide range of physico-chemical properties to the complexes formed by polymers and surfactants, both in bulk and at the interfaces. This latter aspect is especially relevant because of the use of their mixture for the stabilization of dispersed systems such as foams and emulsions, with an increasing interest in several fields such as cosmetic, food science or fabrication of controlled drug delivery structures. This review presents a comprehensive analysis of different aspects related to the phase behavior of these mixtures and their intriguing behavior after adsorption at the liquid/air interface. A discussion of some physical properties of the bulk is also included. The discussion clearly points out that much more work is needed for obtaining the necessary insights for designing polymer-surfactant mixtures for specific applications.
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Affiliation(s)
- Eduardo Guzmán
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
| | - Sara Llamas
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain; Istituto per l'Energetica e le Interfasi-U.O.S. Genova-Consiglio Nazionale delle Ricerche Via de Marini 6, 16149, Genova, Italy
| | - Armando Maestro
- Department of Physics, Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Laura Fernández-Peña
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Andrew Akanno
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain; Instituto Pluridisciplinar-Universidad Complutense de Madrid, Avenida Juan XXIII 1, 28040, Madrid, Spain
| | - Reinhard Miller
- Max-Planck-Institut für Kolloid und Grenzflächenforschung, Am Mühlenberg 1, 14476-Golm, Potsdam, Germany
| | - Francisco Ortega
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain
| | - Ramón G Rubio
- Departamento de Química Física I-Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain; Instituto Pluridisciplinar-Universidad Complutense de Madrid, Avenida Juan XXIII 1, 28040, Madrid, Spain.
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Stabilizing and destabilizing protein surfactant-based foams in the presence of a chemical surfactant: Effect of adsorption kinetics. J Colloid Interface Sci 2016; 462:56-63. [DOI: 10.1016/j.jcis.2015.08.068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 08/28/2015] [Accepted: 08/29/2015] [Indexed: 11/19/2022]
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Lotfi M, Javadi A, Lylyk S, Bastani D, Fainerman V, Miller R. Adsorption of proteins at the solution/air interface influenced by added non-ionic surfactants at very low concentrations for both components. 1. Dodecyl dimethyl phospine oxide. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.12.065] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Cao C, Lei J, Zhang L, Du FP. Equilibrium and dynamic interfacial properties of protein/ionic-liquid-type surfactant solutions at the decane/water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13744-13753. [PMID: 25357256 DOI: 10.1021/la502890w] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The interfacial behavior of β-casein and lysozyme solutions has been investigated in the presence of an ionic liquid-type imidazolium surfactant ([C16mim]Br) at the decane/water interface. The dynamic dilational properties of the protein/surfactant solutions are investigated by the oscillating drop method and interfacial tension relaxation method. The interfacial tension isotherms for the mixed adsorption layers indicate that the increased addition of [C16mim]Br to a pure protein changes the properties of the complex formed at the decane/water interface. Whereas the interfacial tension data of the protein/surfactant mixed layers do not clearly show differences with changing bulk composition, the dilational rheology provides undoubted evidence that the structure and, in particular, the dynamics of the adsorbed layers depend on the bulk surfactant concentration. The experiment data for β-casein/[C16mim]Br solutions indicate that at higher bulk [C16mim]Br concentrations, β-casein in the interfacial layer is subject to conformational changes, where it gives space to [C16mim]Br molecules in the form of coadsorb rather than replacement; in contrast, in lysozyme/[C16mim]Br solutions some lysozyme molecules desorb from the interface due to the competitive adsorption of free [C16mim]Br molecules. Experimental results related to the interfacial dilational properties of the protein/surfactant solutions show that the dilational modulus turns out to be more sensitive to the conformation of protein/surfactant mixture at the liquid interface than the interfacial tension.
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Affiliation(s)
- Chong Cao
- Department of Applied Chemistry, College of Science, China Agriculture University , 2 Yuanmingyuan Xilu, Haidian Dist., Beijing 100193, China
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Surfactant induced complex formation and their effects on the interfacial properties of seawater. Colloids Surf B Biointerfaces 2014; 123:701-9. [PMID: 25456992 DOI: 10.1016/j.colsurfb.2014.10.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 09/18/2014] [Accepted: 10/05/2014] [Indexed: 11/23/2022]
Abstract
The effect of a cationic surfactant, hexadecyltrimethylammonium bromide (CTAB), on the interfacial properties of seawater has been studied by dynamic and equilibrium surface tension and by dilational rheology essays. Important modifications of the surface tension and dilational rheology response have been observed already at the very low CTAB concentrations, where the effects due to the high ionic strength are negligible. The comparison with the effects of CTAB in different seawater models, or in natural seawater fractions, points out the establishment of strong interactions between the surfactant molecules and the lipophilic fraction of organic material dispersed/dissolved in seawater, affecting the interfacial activity of the molecules. Considering the biochemical richness of seawater, these results can be explained assuming interaction mechanisms and adsorption schemes similar to those speculated for protein and other macromolecules in the presence of surfactants, which in fact show similar features. Thus already at the low concentrations the surfactant molecules form highly surface-active complexes with part of the organic fraction of seawater. At the larger surfactant concentrations these complexes compete for adsorption with an excess of free CTAB molecules which, according to the thermodynamic conditions, are most favoured to occupy the liquid interface. The results of this study underline the important role of the sea organic content in enhancing the surface-activity of surfactants, which is relevant for a deeper understand of the direct and indirect effects of these types of pollutants on the physico-chemical environment in the sea coastal areas and develop mitigation strategies.
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Cao C, Huang T, Du FP. Impact of ionic liquid-type imidazolium surfactant additions on dynamic properties of β-casein adsorption layer. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2013.08.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Particle laden fluid interfaces: dynamics and interfacial rheology. Adv Colloid Interface Sci 2014; 206:303-19. [PMID: 24200090 DOI: 10.1016/j.cis.2013.10.010] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 10/09/2013] [Accepted: 10/10/2013] [Indexed: 12/30/2022]
Abstract
We review the dynamics of particle laden interfaces, both particle monolayers and particle+surfactant monolayers. We also discuss the use of the Brownian motion of microparticles trapped at fluid interfaces for measuring the shear rheology of surfactant and polymer monolayers. We describe the basic concepts of interfacial rheology and the different experimental methods for measuring both dilational and shear surface complex moduli over a broad range of frequencies, with emphasis in the micro-rheology methods. In the case of particles trapped at interfaces the calculation of the diffusion coefficient from the Brownian trajectories of the particles is calculated as a function of particle surface concentration. We describe in detail the calculation in the case of subdiffusive particle dynamics. A comprehensive review of dilational and shear rheology of particle monolayers and particle+surfactant monolayers is presented. Finally the advantages and current open problems of the use of the Brownian motion of microparticles for calculating the shear complex modulus of monolayers are described in detail.
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Basu P, Blake-Haskins AW, O'Berry KB, Randolph TW, Carpenter JF. Albinterferon α2b Adsorption to Silicone Oil–Water Interfaces: Effects on Protein Conformation, Aggregation, and Subvisible Particle Formation. J Pharm Sci 2014; 103:427-36. [DOI: 10.1002/jps.23821] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 11/13/2013] [Accepted: 11/18/2013] [Indexed: 02/03/2023]
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Liu Y, Yang L, Mao H, Guo R. Comparative studies on the interaction of [C4mim]Br, and [C8mim]Br with β-casein micelles. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.10.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Orsi D, Vezzani A, Burioni R, Pucci A, Ruggeri G, Cristofolini L. Statistical properties and morphology of a 2D gel network at the air/water interface. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.04.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mixed DPPC-cholesterol Langmuir monolayers in presence of hydrophilic silica nanoparticles. Colloids Surf B Biointerfaces 2013; 105:284-93. [PMID: 23384691 DOI: 10.1016/j.colsurfb.2013.01.020] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 12/19/2012] [Accepted: 01/10/2013] [Indexed: 01/14/2023]
Abstract
Langmuir monolayers of Cholesterol (Chol) and a mixture of Chol with 1,2-Dipalmitoyl-sn-glycerol-3-phosphocholine (DPPC), at a ratio of 17:83 in weight, spread on pure water and on silica nanoparticle dispersions, have been investigated measuring the compression isotherms as well as the surface pressure response to harmonic area variation of the monolayer. Aim of this study was to evaluate the effects of the interaction of silica nanoparticles with Chol and the conditions for the incorporation in the monolayer. In previous works on different kind of lipid monolayers, it has been shown that hydrophilic silica nanoparticles dispersed in the sub-phase may transfer into the monolayer, driven by the interaction with the lipid molecules that make them partially hydrophobic. The results here obtained indicate that also for Chol and Chol-DPPC mixtures the presence of silica nanoparticles may have important effects on the phase behaviour and structural properties of the monolayer. As confirmed by complementary structural characterisations, BAM, AFM and ellipsometry, the principal effect of the nanoparticle incorporation is the disruption of the monolayer packing, owing to the alteration of the cohesive interactions of lipid components.
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Yavuz M, Baysal Z. Preparation and Use of Poly(hydroxyethyl methacrylate) Cryogels ContainingL-Histidine for β-Casein Adsorption. J Food Sci 2013; 78:E238-43. [DOI: 10.1111/1750-3841.12018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 10/31/2012] [Indexed: 11/30/2022]
Affiliation(s)
- Murat Yavuz
- Authors are with Dicle Univ., Faculty of Science, Dept. of Chemistry; 21280 Diyarbakır; Turkey
| | - Zübeyde Baysal
- Authors are with Dicle Univ., Faculty of Science, Dept. of Chemistry; 21280 Diyarbakır; Turkey
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